Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a3f34a2c5c7f75…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 01:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 083b38d366c7e21a9161494b4e672ae3 SHA-1: 8ad740794588bd6fc3c15b86c67e72651976e36f SHA-256: a3a3f34a2c5c7f7550b5565afef29d0381f4cbb0a7e98ca3432180ec618d87cb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains embedded JavaScript and a link farm pointing to multiple external domains, some of which appear to be compromised CMS uploads. The PDF's structure and small size suggest it's designed as an image-based lure to entice users to click on links, likely leading to malware downloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pezenasenchantee.fr/userfiles/file/53228737851.pdf In PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/80719868949.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/rafegarunofinefik.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/74944521200.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/76622714607.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613265441d479---sazixuzixadiwapupugow.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/68259229856.pdfIn PDF document text
    • https://noventa.cz/media/files/file/kikaregigabixawumuwegi.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/retogasolil.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16148e92f15ce4---30067360634.pdfIn PDF document text
    • http://attlas.center/userfiles/file/35302207075.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/kanowupuz.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gagorefofi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab682442e6725bb5eb728f616d5d8fb3/vogebutuvigod.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/83512299330.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/waselifusiwezas.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/45857375105.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/vizuxomafatim.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/tubomifefolorola.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/42335939225.pdfIn PDF document text
    • https://mahae.hu/files/files/14640197446.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/35373343811.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/21853354464.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/85477556876.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/43021356308.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/nelaviloxidizivi.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/15864219722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cell+forge+pro+app+apk+download+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 10616 bytes
SHA-256: a0cab572a7c0eb99e9921ac69eaedbac3050ac943c30a558672870636805867e
font_01_sfnt_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 13780 bytes
SHA-256: 29405784d08708dfe8dacc877fdc84a09e24be3343a49cc17cba36e38803a0b3